Schlerenchyma:Cell wall consist of cellulose, hemicellulose and lignin
Parenchyma:They have thin but flexible cellulose cell walls, and are generally polyhedral when close-packed
Collenchyma:Collenchyma cells are usually living, and have only a thick primary cell wall made up of cellulose and pectin
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Differences are:
collenchyma cell wall is made up of cellulose.
parenchyma cell wall is made up of hemi-cellulose & cellulose
parenchyma cell wall is made up of cellulose & lignin.